<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .logo{
            width: 100px;
            height: 100px;
            background-color: pink;
            float: left;
        }
        .welcome-word{
            width: 100px;
            height: 100px;
            background-color: aqua;
            float: right;
        }
        .content{
            background-color: orange;
            /* 清除浮动 */
            clear: both;
        }
    </style>
</head>
<body>
    <div class="logo"></div>
    <div class="welcome-word"></div>
    <div class="content">
        从这里开始内容
    </div>
</body>
</html>